Telegraphy – Systems – Position coordinate determination for writing
Patent
1995-01-03
1997-06-03
Chin, Wellington
Telegraphy
Systems
Position coordinate determination for writing
G08C 2100
Patent
active
056356846
ABSTRACT:
A device for detecting position which has a good S/N performance and which can be easily designed is provided. Said device has the feature of: a plurality of antennae in which three or more turns of loop coils are arranged in parallel; a transmitting circuit for transmitting an electromagnetic wave via one of the antennae; a receiving circuit for receiving a responding electromagnetic wave from the position indicator; a selecting circuit for selecting one of the antennae; a transmitting/receiving switch circuit for connecting the selected antenna to either of said transmitting circuit or said receiving circuit; a connecting control circuit for controlling operations of the selecting circuit and the transmitting circuit; and a discriminator circuit for discriminating the position and the state of said switch based upon the characteristics of a signal received to send the discriminated information. Said connecting control circuit selects an antenna predicted to be the most proximate antenna to said position indicator during transmission operation of the indicator; and controls such that each of said antennae is sequentially selected to be scanned for reception during receiving operation.
REFERENCES:
patent: Re34187 (1993-03-01), Yamanami et al.
patent: 5023408 (1991-06-01), Murakami et al.
patent: 5028745 (1991-07-01), Yamanami et al.
patent: 5130500 (1992-07-01), Murakami et al.
European Search Report, Dated Mar. 11, 1996, Appl. No. EP 95 10 0477.
Berenato, III Joseph W.
Chin Wellington
Loomis Paul
Wacom Co. Ltd.
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